Bonjour, pouvez m'aider à resoudre les équations suivante svp ? Je n'y arrive pas.

A). 2x +(5x - 2) = 7x + 9 - x .
B). 12 - (x + 3) = 2x + (-5 +x).
C). (7x + 4) - (-3x + 1) = 0 .

Merci d'avance.
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